How does the pricing/billing work?

Stormboard is priced per user (participant). When someone joins a Storm, they are automatically upgraded and added to your team and your bill.

Monthly subscriptions, Startup and Business, are billed at the end of the month for the number of enabled users in that month.

For an Annual subscription, you pick a set number of seats and that is the maximum people you can have on your team at once. If you need more seats you can either disable users and replace them, or purchase more seats at a pro-rated rate.